...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Synthesis of Calcium Ferrite from Waste Gypsum Board
【24h】

Synthesis of Calcium Ferrite from Waste Gypsum Board

机译：废石膏板合成铁酸钙

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Herein, we investigate the chemical recycling of waste gypsum board obtaining synthetic calcium ferrite for making steel. Thermodynamic estimation and results of small-scale heating tests revealed that decomposition of gypsum was promoted in the partial pressure of O_(2) and lower partial pressure of SO_(2) by preventing the formation of CaS. The addition of Fe_(2)O_(3) to gypsum helped reduce the decomposition temperature of gypsum, resulting in formation of calcium ferrite in a lower temperature. Decomposition of gypsum was incomplete after heating in air at 1180°C, whereas calcium ferrite was successfully obtained by a two-step heat treatment of gypsum: forming CaS through carbon reduction and heating the fine mixture of Fe_(2)O_(3) and CaS at 1180°C. Calcium ferrite can also be obtained in a single heat treatment if we use the proper gas and material conditions. After trial tests using a large-scale rotary kiln, we confirmed that heating a sample containing gypsum, coke fine, and Fe_(2)O_(3) at a temperature less than 1200°C resulted in the formation of calcium ferrite accompanied with a high desulfurization degree of gypsum.
机译：在本文中，我们研究了废石膏板的化学回收利用，从而获得了用于制造钢的合成铁酸钙。热力学估计和小规模加热试验的结果表明，通过阻止CaS的形成，石膏的分解在O_（2）的分压和SO_（2）的较低分压中得到了促进。在石膏中添加Fe_（2）O_（3）有助于降低石膏的分解温度，从而在较低的温度下形成铁酸钙。在空气中于1180°C加热后，石膏的分解不完全，而石膏的两步热处理成功地获得了铁素体钙：通过碳还原形成CaS并加热Fe_（2）O_（3）和CaS在1180°C下。如果我们使用适当的气体和材料条件，也可以通过一次热处理获得铁酸钙。经过使用大型回转窑的试验测试，我们确认了在低于1200°C的温度下加热包含石膏，焦炭细粉和Fe_（2）O_（3）的样品会导致形成铁酸钙并伴随着石膏的高脱硫率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号